During the course of panellising my amplifier board artwork for production, I am often left with narrow slivers of waste space, I pay for. So I devised these long narrow extender boards for mounting 2 sets of 3 IRFP MOSFETS or anything in the same package. The drains and sources are paralleled to suit matched devices and they are all through hole plated and solder masked both sides. They have the correct 5.5mm pin spacing.
To neaten up your project - or add HD output stage.
They're free to anyone interested (MOSFETs not included) - max 4!
See Pic -
Cheers,
Greg
To neaten up your project - or add HD output stage.
They're free to anyone interested (MOSFETs not included) - max 4!
See Pic -
Cheers,
Greg
Attachments
Hi Pavel,
The gates are not connected to anything but there is a thin track to solder 1/2W resistors from the pad to common track. There just wasn't any room to provide for the AXIAL0.4 R's.. It's just to tidy up extensions of power stages. 3 pair.
Another thread a while back we discussed boosting the SKA for low Z loads with a conventional SF output stage by replacing the output fuses with 100R and driving 3 pair MOSFETS. It was about this time when I did the PCB but have never taken it further.
Cheers,
Greg
The gates are not connected to anything but there is a thin track to solder 1/2W resistors from the pad to common track. There just wasn't any room to provide for the AXIAL0.4 R's.. It's just to tidy up extensions of power stages. 3 pair.
Another thread a while back we discussed boosting the SKA for low Z loads with a conventional SF output stage by replacing the output fuses with 100R and driving 3 pair MOSFETS. It was about this time when I did the PCB but have never taken it further.
Cheers,
Greg
Are you using output fuses ? They have relative high resistance ( nonlinear )... Why not fuses at drain ?
Yes Pavel,
i use +ve and -ve fuses from drains to output node, as it's common source. Thats why I can replace them with 100R resistor and drive a row of EF's with it - and they'd still be in the NFB loop. I haven't tried this yet and I thinkl the gain with 100R load or more instead of 8R might be a challenge.
Cheers,
Greg
i use +ve and -ve fuses from drains to output node, as it's common source. Thats why I can replace them with 100R resistor and drive a row of EF's with it - and they'd still be in the NFB loop. I haven't tried this yet and I thinkl the gain with 100R load or more instead of 8R might be a challenge.
Cheers,
Greg
CS configuration ? Have you good protected gates against overvoltage ? When one blow, feedback " pull " there full value of driving voltage...
Hi Pavel,
Don't you worry about my CS output, both are proteced with 5V6 zeners on the gates and 10mA max current gate drive.
No takers for the extender boards?
Cheers,
Greg
Don't you worry about my CS output, both are proteced with 5V6 zeners on the gates and 10mA max current gate drive.
No takers for the extender boards?
Cheers,
Greg
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